Update openstack_version to rocky

Change-Id: I0a19a398a9fc194cc6e48d4025b154838a496fe3
diff --git a/classes/cluster/virtual-mcp11-aio/openstack/init.yml b/classes/cluster/virtual-mcp11-aio/openstack/init.yml
index 3f9b2d0..4b62aed 100755
--- a/classes/cluster/virtual-mcp11-aio/openstack/init.yml
+++ b/classes/cluster/virtual-mcp11-aio/openstack/init.yml
@@ -42,7 +42,7 @@
 - service.runtest.tempest
 parameters:
   _param:
-    openstack_version: queens
+    openstack_version: rocky
     openstack_node_role: primary
     cluster_public_host: ${_param:single_address}
     cluster_public_protocol: http